<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="">
    <meta name="author" content="Mosaddek">
    <meta name="keyword" content="FlatLab, Dashboard, Bootstrap, Admin, Template, Theme, Responsive, Fluid, Retina">
    <link rel="shortcut icon" href="img/favicon.html">

    <title>贝蒂波普后台管理系统</title>

    <!-- Bootstrap core CSS -->
    <link href="__PUBLIC__/css/bootstrap.min.css" rel="stylesheet">
    <link href="__PUBLIC__/css/bootstrap-reset.css" rel="stylesheet">
    <!--external css-->
    <link href="__PUBLIC__/assets/font-awesome/css/font-awesome.css" rel="stylesheet" />
    <!-- Custom styles for this template -->
    <link href="__PUBLIC__/css/style.css" rel="stylesheet">
    <link href="__PUBLIC__/css/style-responsive.css" rel="stylesheet" />

    <!-- HTML5 shim and Respond.js IE8 support of HTML5 tooltipss and media queries -->
    <!--[if lt IE 9]>
    <script src="__PUBLIC__/js/html5shiv.js"></script>
    <script src="__PUBLIC__/js/respond.min.js"></script>
    <![endif]-->
</head>
  <body class="login-body">
<div class="header1" id="demo">
    <div class="nav">
   <div class="container" draggable="true">
      <form class="form-signin" action="__URL__/checkLogin" method="post" autocomplete="off">
        <h2 class="form-signin-heading">登陆</h2>
        <div class="login-wrap">
            <input type="text" name="admin_name" class="form-control"  autofocus>
            <input type="password" name="admin_pass" class="form-control">
<!--             <label class="checkbox">
                <input type="checkbox" value="remember-me">记住登陆状态
                <span class="pull-right"> <a href="#"> 忘记密码?</a></span>
            </label> -->
            <button class="btn btn-lg btn-login btn-block" type="submit">登陆</button>
        </div>
      </form>
    </div>
   </div>
    
  <div class="canvaszz"> </div>
  <canvas id="canvas"></canvas> 
</div>



    <style type="text/css">

body {margin:0 auto;overflow:hidden;}  
.form-signin h2.form-signin-heading{
  background:#424242 none repeat scroll 0 0;
}
/*=============第一页=============*/   
.header1{
    margin:0 auto;
    background-color:#000;
    position:relative;
    }
.header1 canvas {
    height:auto;
    display:inline-block;vertical-align:baseline
    position:absolute;
    z-index:-1;
}
.header1 .canvaszz{  /*用来解决视频右键菜单，用于视频上面的遮罩层*/
    width:100%;
    background-image: url(__PUBLIC__/images/login_background.jpg);
filter:"progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale')";
-moz-background-size:100% 100%;
background-size:100% 100%;

    height:100%;
    position:absolute;
    z-index:10;
    filter:alpha(opacity=40);  
    -moz-opacity:0.4;  
    -khtml-opacity: 0.4;  
    opacity: 0.4;
}
.header1 .nav{
    width:300px;
    height:auto;
    position:absolute;
    float: right;
    z-index:30;
    left:10%;
}
</style>

<script src="__PUBLIC__/js/jquery-1.8.3.min.js" type="text/javascript"></script>
<script src="__PUBLIC__/js/jquery-ui.js" type="text/javascript"></script>
<link rel="stylesheet" href="__PUBLIC__/css/jquery-ui.css">
<script>
      var winH = $(window).height();
      var winw = $(window).width();
      $("header1").height(winH);
      $("header1").width(winw);
      $("#canvas").width(winw);
      $(".canvaszz").width(winw);
$(".container").draggable();
var canvas = document.getElementById('canvas'),
  ctx = canvas.getContext('2d'),
  w = canvas.width = window.innerWidth,
  h = canvas.height = window.innerHeight,

  hue = 217,
  stars = [],
  count = 0,
  maxStars = 1300;

var canvas2 = document.createElement('canvas'),
  ctx2 = canvas2.getContext('2d');
canvas2.width = 100;
canvas2.height = 100;
var half = canvas2.width / 2,
  gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
gradient2.addColorStop(0.025, '#CCC');
gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
gradient2.addColorStop(1, 'transparent');

ctx2.fillStyle = gradient2;
ctx2.beginPath();
ctx2.arc(half, half, half, 0, Math.PI * 2);
ctx2.fill();


function random(min, max) {
  if (arguments.length < 2) {
    max = min;
    min = 0;
  }

  if (min > max) {
    var hold = max;
    max = min;
    min = hold;
  }

  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function maxOrbit(x, y) {
  var max = Math.max(x, y),
    diameter = Math.round(Math.sqrt(max * max + max * max));
  return diameter / 2;
  //星星移动范围，值越大范围越小，
}

var Star = function() {

  this.orbitRadius = random(maxOrbit(w, h));
  this.radius = random(60, this.orbitRadius) / 8; 
  //星星大小
  this.orbitX = w / 2;
  this.orbitY = h / 2;
  this.timePassed = random(0, maxStars);
  this.speed = random(this.orbitRadius) / 50000; 
  //星星移动速度
  this.alpha = random(2, 10) / 10;

  count++;
  stars[count] = this;
}

Star.prototype.draw = function() {
  var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
    y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
    twinkle = random(10);

  if (twinkle === 1 && this.alpha > 0) {
    this.alpha -= 0.05;
  } else if (twinkle === 2 && this.alpha < 1) {
    this.alpha += 0.05;
  }

  ctx.globalAlpha = this.alpha;
  ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
  this.timePassed += this.speed;
}

for (var i = 0; i < maxStars; i++) {
  new Star();
}

function animation() {
  ctx.globalCompositeOperation = 'source-over';
  ctx.globalAlpha = 0.5; //尾巴
  ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 2)';
  ctx.fillRect(0, 0, w, h)

  ctx.globalCompositeOperation = 'lighter';
  for (var i = 1, l = stars.length; i < l; i++) {
    stars[i].draw();
  };

  window.requestAnimationFrame(animation);
}

animation();
</script>
  </body>
</html>
